Mossberg begins his article by stating that there are two main ways to run Microsoft Windows on a Mac, one is by using Apple's Boot Camp software and the other is to use a virtualization application such as Fusion or Parallels.  He states:

"The second approach uses one of two third-party programs to create a virtual Windows PC inside your Mac. This faux Windows machine runs at normal speeds and can operate simultaneously with the Mac's own operating system. Programs native to each operating system can run side by side. The downside is that, because Windows doesn't get complete control of the computer's hardware, it isn't quite as fast as in Boot Camp, and a few of its functions, like 3D graphics, don't work as well."

Mossberg later on states that in his view, Fusion is better than Parallels.  He mentions:

"I've been testing Fusion 2.0 for a couple of weeks on two different Macs, and using it to run both Windows XP and Windows Vista. My verdict is that while you won't go wrong with Parallels, Fusion edges it out as the better product."

He goes on to contrast Fusion with Parallels indicating that a key features available with Fusion is that you can now take multiple "snapshots" as a way to protect your Windows virtual machine.  If an issue is encountered, simply revert back to a prior snapshot.  He then goes on to highlight features that are only available in Fusion:

"But Fusion has some other features Parallels lacks. For example, it allows you to automatically take those protective snapshots at timed intervals. It also permits you to completely customize keyboard commands so that the same common key combinations work in both Windows and Mac programs. It allows the faux Windows machine to take full advantage of multiple monitors, if you have them."

"Fusion also uses a more modern and capable version of the proprietary 3-D graphics system in Windows, called DirectX. That means some Windows-only games and other programs that won't work in Parallels will work in Fusion. I successfully tested two such programs, both from Microsoft: Worldwide Telescope and Photosynth."

You can read his entire article at the Personal Technology section of WSJ.com.

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